/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/**
 * @author Alexei Y. Zakharov
 */

package org.apache.harmony.jndi.provider.dns;

import java.util.StringTokenizer;

import org.apache.harmony.jndi.internal.nls.Messages;

/**
 * Represents a DNS pseudo URL.
 */
public class DNSPseudoURL {

	private String host = "localhost"; //$NON-NLS-1$

	private int port = ProviderConstants.DEFAULT_DNS_PORT;

	private String domain = "."; //$NON-NLS-1$

	private boolean hostIpWasGiven = false;

	/**
	 * Parses given argument and constructs new <code>DNSPseudoURL</code>
	 * object. The format of the argument is:<br>
	 * <code>dns:[//host[:port]][/domain]</code><br>
	 * If no host information was given then <code>localhost</code> will be
	 * used. If no port was given then the standard DNS server port
	 * <code>53</code> will be used. If no domain was given then the root domain
	 * will be used. All domain here are treated as absolute domains.
	 * 
	 * @param DNS
	 *            string representation of DNS URL
	 * @throws IllegalArgumentException
	 *             if the argument is not in acceptable format
	 * @throws NullPointerException
	 *             if the argument is null
	 */
	public DNSPseudoURL(String strForm) throws IllegalArgumentException {
		StringTokenizer st = null;
		StringTokenizer st2 = null;
		String token;

		if (strForm == null) {
			// jndi.67=strForm is null
			throw new NullPointerException(Messages.getString("jndi.67")); //$NON-NLS-1$
		}
		st = new StringTokenizer(strForm, "/", true); //$NON-NLS-1$
		if (!st.hasMoreTokens()) {
			// jndi.68=Empty URL
			throw new IllegalArgumentException(Messages.getString("jndi.68")); //$NON-NLS-1$
		}
		// scheme
		token = st.nextToken();
		if (!token.equals("dns:")) { //$NON-NLS-1$
			// jndi.69=Specified scheme is not dns
			throw new IllegalArgumentException(Messages.getString("jndi.69")); //$NON-NLS-1$
		}
		// host
		if (st.hasMoreTokens()) {
			token = st.nextToken();
			if (!token.equals("/") || !st.hasMoreTokens()) { //$NON-NLS-1$
				// jndi.6A=Bad URL syntax
				throw new IllegalArgumentException(
						Messages.getString("jndi.6A")); //$NON-NLS-1$
			}
			token = st.nextToken();
			if (token.equals("/")) { //$NON-NLS-1$
				// host[:port] was given
				if (!st.hasMoreElements()) {
					// jndi.6A=Bad URL syntax
					throw new IllegalArgumentException(
							Messages.getString("jndi.6A")); //$NON-NLS-1$
				}
				token = st.nextToken();
				st2 = new StringTokenizer(token, ":"); //$NON-NLS-1$
				host = st2.nextToken();
				try {
					ProviderMgr.parseIpStr(host);
					hostIpWasGiven = true;
				} catch (final IllegalArgumentException e) {
					hostIpWasGiven = false;
				}
				// port
				if (st2.hasMoreTokens()) {
					port = Integer.parseInt(st2.nextToken());
				}
				// domain
				if (st.hasMoreTokens()) {
					token = st.nextToken();
					if (!token.equals("/") || !st.hasMoreTokens()) { //$NON-NLS-1$
						// jndi.6A=Bad URL syntax
						throw new IllegalArgumentException(
								Messages.getString("jndi.6A")); //$NON-NLS-1$
					}
					domain = ProviderMgr.normalizeName(st.nextToken());
				}
			} else {
				// domain
				domain = ProviderMgr.normalizeName(token);
			}
			// extra
			if (st.hasMoreTokens()) {
				// jndi.66=Extra characters encountered at the end of the URL
				throw new IllegalArgumentException(
						Messages.getString("jndi.66")); //$NON-NLS-1$
			}
		}
	}

	/**
	 * @return Returns the domain.
	 */
	public String getDomain() {
		return domain;
	}

	/**
	 * @return Returns the host.
	 */
	public String getHost() {
		return host;
	}

	/**
	 * @return Returns the port.
	 */
	public int getPort() {
		return port;
	}

	/**
	 * @return Returns the hostIpWasGiven.
	 */
	public boolean isHostIpGiven() {
		return hostIpWasGiven;
	}

}
